US4791499A - Method and apparatus for reproduction of video signals from magnetic tape at a tape transport speed differing from that of recording - Google Patents

Method and apparatus for reproduction of video signals from magnetic tape at a tape transport speed differing from that of recording Download PDF

Info

Publication number
US4791499A
US4791499A US06/936,827 US93682786A US4791499A US 4791499 A US4791499 A US 4791499A US 93682786 A US93682786 A US 93682786A US 4791499 A US4791499 A US 4791499A
Authority
US
United States
Prior art keywords
memory
picture
erasing
administrative
information
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/936,827
Other languages
English (en)
Inventor
Roland Mester
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Assigned to ROBERT BOSCH GMBH, A LIMITED LIABILITY COMPANY OF GERMANY reassignment ROBERT BOSCH GMBH, A LIMITED LIABILITY COMPANY OF GERMANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MESTER, ROLAND
Application granted granted Critical
Publication of US4791499A publication Critical patent/US4791499A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/93—Regeneration of the television signal or of selected parts thereof
    • H04N5/937—Regeneration of the television signal or of selected parts thereof by assembling picture element blocks in an intermediate store

Definitions

  • the invention relates to reproduction of video signals from magnetic tape at a rate faster or slower than that of recording.
  • U.S. Pat. No. 4,139,867 shows a method for reproducing video signals recorded on a record medium in individual tracks, which method permits both slow-motion and accelerated-motion reproduction.
  • the magnetic head is mounted on the periphery of a head wheel which scans the tape in paths which lie at an angle to the recorded tracks which depends upon the selected playback speed and of course run across the recorded tracks in so doing.
  • Track sections that are good enough to store in terms of satisfying prescribed requirements are written into an intermediate memory and are read out to put together out of these track sections a complete television picture corresponding to a television transmission standard.
  • addressing For successive writing in of the video signals into an intermediate memory and reading out therefrom in accordance with television standards, addressing is necessary. This addressing can be carried out linewise or also blockwise, and the addresses can be either presumed to be already known as in the case of U.S. Pat. No. 4,139,867 or already recorded along with the video information on the tape, or else can be derived during reproduction from machine - specific data. Methods for obtaining the memory addresses are found for example in U.S. Pat. Nos. 4,210,938 and 4,293,879.
  • the known methods provide for reproduction of the video signals recorded on the magnetic tape at normal speed, in principle, with every possible slowing or acceleration of the transport speed, but, on the other hand, the feature composition, particularly in accelerated (time-shortening) reproduction,in general runs irregularly because of the use of memories or infinite integration time, i.e. certains parts are replaced by current video data only after relatively long time intervals.
  • the over-aged video data produce a torn-up picture impression.
  • the maximum storage time of picture information in the picture memory is made a function of the tape transport speed. It is furthermore desirable to put the picture information together in groups or blocks and to assign an age designation to each group or block. It is then desirable also to erase groups or blocks of picture information in the picture memory as soon as the described memory preservation time for the particular group or block has expired.
  • the erasing is preferably by writing "erasing information" on top of the group of picture information to be erased in the picture memory.
  • the drawing shows a picture memory 11 for storing the luminance value of a color television signal to which the video signals are supplied in digitized form, for example as words eight bits wide, over the change-over switch 10 by way of which they reach the data input of the picture memory 11.
  • the number of values that are stored is sufficient either for a full frame of a picture or just for one field of a picture.
  • the picture memory is more aptly designatable as a "replenishment store".
  • the video data are subdivided into blocks of, for example, 60 bytes which are collectively protected from errors and are accompanied by a block identification signal.
  • block identification signals are supplied to a second input of the picture memory 11 and determine the addresses under which the block in question will be deposited in the picture memory.
  • the block identification signals simultaneously go to a register 7 through a second change-over switch 3 and also to the address input of a control or administrative memory 4.
  • the register 7 consists, for example, of 14 flipflops.
  • the administrative memory 4 has just one storage place corresponding to each block of a frame. Assuming now that the picture memory 11 is a full-frame memory and that each of the blocks are composed of 60 bytes, fewer than 16K words need to be administered in the administration memory 4.
  • the greatest permissible age for video information in the picture memory 11 is determined by, among other things, the factor by which the reproduction speed is raised compared to the tape speed at the time of recording.
  • a data word is put into a register 1 that likewise can consist of many parallel flipflops, at the D input of the register which is allocated for the largest possible age value.
  • This data word is supplied to the D input of the administrative memory 4 through a transfer contact of the change-over switch 3.
  • a programmable read-only memory 5 is connected to the output of the administrative memory 4 and has an output D 1 . . . n that is connected with the second contact of the change-over switch 3, so that in switching over of that switch from the output of the register 1 to the second contact, the output of the programmable read-only memory (PROM) 5 is connected with the input of the administrative memory 4.
  • a counting pulse rate is prescribed at the same time that the search operation speed is set.
  • the counting pulses operate on the counting input of the block address counter 2.
  • the output of the block address counter 2 is connected to the second input of the second change-over switch in the multiple change-over switch 3.
  • the counting pulses just mentioned also proceed to the clock input of a second register 7, the input of which is connected with the address input of the administrative memory 4.
  • the register 7 has an output connected with the input of a buffer memory 9.
  • the buffer memory 9 can be of the first-in first-out (FIFO) type.
  • the output of the buffer memory 9 is applied to an input of the multiple change-over switch 10, the other change-over switch of which selectively switches between video data and an erasing value generator 6.
  • the memory duration controller 8 which from another of its outputs also affects the multiple change-over switch 3.
  • the memory duration controller 8 which can be called a “persistance controller” for short, also controls the manner of operation of the administrative memory 4 as will be further explained below.
  • the E (enable) input of the register 7 is affected by the null output of the PROM 5 and likewise the memory duration controller 8.
  • the manner of operation of the above-described system during reproduction at a tape transport speed deviating from the recording tape transport speed can be described as follows:
  • the video data are written into the picture memory 11 while the block identification signals which are written into the address input of the picture memory 11 represent the addresses.
  • the stored data are read out of the picture memory 11 and are supplied, with interposition of an error concealment apparatus 12, to the picture display apparatus 13.
  • the memory duration controller 8 recognizes when it must deal with a new block identification, on the basis of the regularities existing at various reproduction speeds.
  • the change-over switch 3 is so switched (i.e. to its lower position in the drawing) at the appearance of a block identification that the latter is guided to the address input of the administrative memory 4.
  • the memory duration value for this particular block identification is put into the administrative memory and has a value corresponding to the particular reproduction speed.
  • the change-over switch 3 is so switched (i.e. to its upper position in the drawing) that the output of the block identification counter 2 is connected to the address input of the administrative memory 4 and at the same time the output D 1 ...n of the PROM 5 is connected with the D input of the administrative memory 4.
  • the block identification addresses contained in the administrative memory 4 are counted through by the block identification counter 2 during the time in which the switch 3 remains in its upper position and at the same time the particular addresses are supplied to the address input of the administrative memory 4.
  • the corresponding current memory duration value present in the administrative memory 4 is put into the PROM 5 and reduced in value by 1. This value lowered by 1 is put anew into the administrative memory 4 from the output D 1 . . . . n.
  • the memory duration controller 8 receives information over a conductor 15 whenever interruption occurs in the block identification address rhythm. Such interruptions can arise, for example, when the magnetic heads on the head wheel, in search operation, cross tracks and as a result receive no decodable signals. In these time regions the change-over switch 10 is switched over so that the output of the buffer memory 9 is connected with the block identification input of the picture memory 11 and the output of the erasing value generator 6 is connected with the data input of the picture memory 11.
  • the block identification addresses called out of the buffer memory 9 have the effect that in the picture memory 11 new data are written under the particular addresses, which data however come from the erasing value generator 6 and therefore do not represent any picture content. In consequence, the picture content up to then stored under these particular block identification address appears to be erased.
  • the picture memory 11 and the error concealment apparatus 12 are constituted in at least two planes or levels so that corresponding control can readily be provided for the luminance signals and for the chrominance signals. These may be correspondingly stored at the same time and erased after running of the prescribed storage time.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Signal Processing For Recording (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
US06/936,827 1985-12-10 1986-12-02 Method and apparatus for reproduction of video signals from magnetic tape at a tape transport speed differing from that of recording Expired - Fee Related US4791499A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3543540 1985-12-10
DE19853543540 DE3543540A1 (de) 1985-12-10 1985-12-10 Verfahren zur wiedergabe von auf magnetband gespeicherten videosignalen mit einer von der bandgeschwindigkeit bei der aufnahme abweichenden bandgeschwindigkeit und schaltungsanordnung hierfuer

Publications (1)

Publication Number Publication Date
US4791499A true US4791499A (en) 1988-12-13

Family

ID=6288060

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/936,827 Expired - Fee Related US4791499A (en) 1985-12-10 1986-12-02 Method and apparatus for reproduction of video signals from magnetic tape at a tape transport speed differing from that of recording

Country Status (4)

Country Link
US (1) US4791499A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS62155684A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE3543540A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2591410A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2236230A (en) * 1989-07-06 1991-03-27 Broadcast Television Syst Playback of magnetically recorded digital video data at variable speed; error concealment
US5126852A (en) * 1990-04-27 1992-06-30 Matsushita Electric Industrial Co., Ltd. Compressed video signal recording/variable-speed reproduction apparatus
EP0557015A3 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1992-02-12 1994-02-23 Sony Corp
US5973867A (en) * 1994-11-10 1999-10-26 Mitsubishi Denki Kabushiki Kaisha Signal recording and playback apparatus for location monitoring which records prior to sensor input
US20040170064A1 (en) * 1989-04-13 2004-09-02 Eliyahou Harari Flash EEprom system
US20050286336A1 (en) * 1989-04-13 2005-12-29 Eliyahou Harari Flash EEprom system
US20060179462A1 (en) * 2001-11-13 2006-08-10 Brittish Sky Broadcasting Ltd. Receivers for television signals
US7447069B1 (en) 1989-04-13 2008-11-04 Sandisk Corporation Flash EEprom system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4279024A (en) * 1978-06-30 1981-07-14 Siemens Aktiengesellschaft Word-by-word electrically reprogrammable nonvolatile memory
US4597020A (en) * 1983-05-11 1986-06-24 Wilkinson James H Digital video tape recorder apparatus

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2642019C2 (de) * 1976-09-18 1982-06-03 Robert Bosch Gmbh, 7000 Stuttgart Verfahren zur Wiedergabe von auf einem Aufzeichnungsträger - vorzugsweise Magnetband - in einzelnen Spuren aufgezeichneten Videosignalen
DE2645017C3 (de) * 1976-10-06 1981-02-05 Robert Bosch Gmbh 7000 Stuttgart Verfahren zur Steuerung eines frei adressierbaren Speichers für digitalisierte Videosignale
DE2725365C2 (de) * 1977-06-04 1984-09-06 Robert Bosch Gmbh, 7000 Stuttgart Verfahren zur Wiedergabe von auf Magnetband gespeicherten Videosignalen mit einer von der Bandgeschwindigkeit bei der Aufnahme abweichenden Bandgeschwindigkeit und Schaltungsanordnung hierfür
DE2841728C2 (de) * 1978-09-26 1984-08-09 Robert Bosch Gmbh, 7000 Stuttgart Verfahren und Schaltungsanordnung zur Wiedergabe eines auf Magnetband gespeicherten Videosignals mit veränderlicher Geschwindigkeit
JPS6148281A (ja) * 1984-08-14 1986-03-08 Sony Corp 映像信号再生装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4279024A (en) * 1978-06-30 1981-07-14 Siemens Aktiengesellschaft Word-by-word electrically reprogrammable nonvolatile memory
US4597020A (en) * 1983-05-11 1986-06-24 Wilkinson James H Digital video tape recorder apparatus

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040170064A1 (en) * 1989-04-13 2004-09-02 Eliyahou Harari Flash EEprom system
US7447069B1 (en) 1989-04-13 2008-11-04 Sandisk Corporation Flash EEprom system
US20050286336A1 (en) * 1989-04-13 2005-12-29 Eliyahou Harari Flash EEprom system
US5223987A (en) * 1989-07-06 1993-06-29 Bts Broadcast Television Systems Gmbh Method and apparatus for reproducing at a selected speed video signals recorded on magnetic tape
GB2236230B (en) * 1989-07-06 1993-12-01 Broadcast Television Syst Method and apparatus for the playback of video signals recorded on magnetic tape
GB2236230A (en) * 1989-07-06 1991-03-27 Broadcast Television Syst Playback of magnetically recorded digital video data at variable speed; error concealment
US5126852A (en) * 1990-04-27 1992-06-30 Matsushita Electric Industrial Co., Ltd. Compressed video signal recording/variable-speed reproduction apparatus
EP0557015A3 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1992-02-12 1994-02-23 Sony Corp
US5375019A (en) * 1992-02-12 1994-12-20 Sony Corporation Picture enhancing circuit
US5973867A (en) * 1994-11-10 1999-10-26 Mitsubishi Denki Kabushiki Kaisha Signal recording and playback apparatus for location monitoring which records prior to sensor input
US20060179462A1 (en) * 2001-11-13 2006-08-10 Brittish Sky Broadcasting Ltd. Receivers for television signals
RU2390965C2 (ru) * 2001-11-13 2010-05-27 Бритиш Скай Бродкастинг Лтд. Приемник телевизионных сигналов
EP2290960B1 (en) * 2001-11-13 2013-04-03 British Sky Broadcasting Limited Improvements in receivers for television signals
US9084017B2 (en) 2001-11-13 2015-07-14 British Sky Broadcasting Ltd. Receivers for television signals
US9113209B2 (en) 2001-11-13 2015-08-18 British Sky Broadcasting Ltd Receivers for television signals
US9124935B2 (en) 2001-11-13 2015-09-01 British Sky Broadcasting Ltd. Receivers for television signals

Also Published As

Publication number Publication date
DE3543540C2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1990-07-26
DE3543540A1 (de) 1987-06-11
JPS62155684A (ja) 1987-07-10
FR2591410A1 (fr) 1987-06-12

Similar Documents

Publication Publication Date Title
US4139867A (en) Method for fast- and slow-motion reproduction of video signals stored in a succession of parallel tracks on a record medium
US4395738A (en) Helical scan tape recording and/or replay apparatus
US4161753A (en) Video recording disk with interlacing of data for frames on the same track
EP0163481B1 (en) Disc drive control apparatus for recording and/or reproducing digital data
EP0338009B1 (en) Improvements in and relating to the recording and editing of moving television pictures
EP0153820B1 (en) Digital television signal processing apparatus
US4577237A (en) Error correction in digital television signals
US4791499A (en) Method and apparatus for reproduction of video signals from magnetic tape at a tape transport speed differing from that of recording
CA1310108C (en) Apparatus for processing digital data
US6788881B1 (en) Storage medium and apparatus and method of recording and reproducing encoded data thereto and therefrom
JPH0345092A (ja) 磁気テープに記録されているビデオ信号の再生方法及び再生装置
US4665443A (en) Signal recording and reproducing apparatus
JP3740213B2 (ja) 再生装置
US4905099A (en) Intermediate picture field storage system for variable speed magnetic tape video data read-out
KR100266051B1 (ko) 디지털 신호 기록 방법, 기록 장치 및 기록 매체
EP0468646A2 (en) Reproducing apparatus for temporarily writing reproduced data into memory
US5047873A (en) Split swipe tape recording
US5043825A (en) Intermediate picture field storage system for slow motion playback of video tape recording
US3947877A (en) Method and device for timing the data reading and the recording operations on a magnetic tape
KR880009337A (ko) 헬리컬 스캐닝 기록방식 비디오 레코더
WO1998034228A3 (en) Recording of a trick play signal in a helical scan type recording apparatus
JP3640100B2 (ja) 再生装置
JP2560016B2 (ja) ディジタルデータレコーダ
JPH0675337B2 (ja) ディジタルデータレコーダ
JP2896998B2 (ja) 記録再生装置

Legal Events

Date Code Title Description
AS Assignment

Owner name: ROBERT BOSCH GMBH, POSTFACH 50 D-7000 STUTTGART 1,

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MESTER, ROLAND;REEL/FRAME:004639/0111

Effective date: 19861126

Owner name: ROBERT BOSCH GMBH, A LIMITED LIABILITY COMPANY OF

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MESTER, ROLAND;REEL/FRAME:004639/0111

Effective date: 19861126

FPAY Fee payment

Year of fee payment: 4

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
FP Lapsed due to failure to pay maintenance fee

Effective date: 19961218

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362